Where I am there's no statewide public drinking ban outside of schools or government facilities - municipalities can restrict it somewhat, but if I were to stroll down the street drinking I wouldn't get stopped unless I was being a nuisance or clearly unable to function.
Can't take alcohol from the bar or a restaurant if it's open container, but if I buy a 6-pack at the store it's free game.
I can also go to the drive-thru and get booze from the beer barn down the block, and the passengers in my vehicle can drink all they want.
Different state, but yes, no stipulations on where the liquour is in the car so long as the driver doesn't touch or drink it. Fond memories of my early 20s rolling down to the bar in the back of a truck with the pregame still going.